Stamp.



No. 652,095. Patented .lune I9', i900. 4

M. H.A IlllaSCO LL.

STAM P.

(Apglinatign, filed June 23, 1699.)

(N o M o d el.)

'j i] *n v2.5/

A HORA/ rs UNITED STATES f PATENT O'EEICWSE MARTIN R. DRISCOLL, OFFRISCO, UTAH.

STAM P.

SPECIFICATIQN forming part of Letters Patent No. 652,095, dated June 19,1900.

Application filed June 23,1899.

To @ZZ whom. it may concern.-

Be it known that I, MARTIN R. DRIscoLL, of Frisco, in the county ofBeaver and State of Utah, have invented a new and useful Improvement inStamps, of which the following is a full, clear, and exact description.

My invention relates to an improvement in stamps for stamp-mills, andparticularly to the manner in which a stamp head or boss is secured to astamp.

One object of my invention is to provide a means for attaching a stampto a bossy so that the hitherto troublesome necessity of dressing theend of the stem to nt a socket in the head or boss is avoided and theliability of the stem to breakage is greatly reduced and so that in theevent of the breakage of the stem the fracture will be comparativelysmall and may be expeditiously and conveniently drifted out from thestamp head or boss.

Another object of the invention is to assure a firm contact between thestem and stamp head or boss and in a simpler, less expensive, moreeffective, and more expeditious manner than heretofore.

The invention consists in the novel construction and combination of theseveral parts, as will be hereinafter fully set forth,

and pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the gures.

Figure l represents a stamp head, stem, and mandrel of a stamp-mill,together with the means for operating the same. Fig. 2 is an enlargedview, partly in side elevation and partly in section, of the boss orhead of the stamp and likewise a side elevation of that portion of thestem that enters the boss and a vertical section through the deviceemployed for attaching the stem to the boss. Fig. 3 is a horizontalsection taken practically on the line 3 3 ofFig. 2. Fig. i is a sideelevation of the plug and one of the straps or keys used in connectionwith the plug, the said parts constituting a portion of the fasteningdevice for the stem and boss. Fig. 5 is an inner face view of one of thestraps of the fastening device, and Fig. 6 is an end view of the plug ofthe fastening device.

Serial No. 721,582. (No model.)

A represents a platform or door; B, a driveshaft; C, a drivin g-pulleyconnected with said shaft; D, the stem of a stamp-mill, and E the heador boss connected with the stem, said head or boss being provided withthe usual shoe e. The drive-shaft B is represented as provided with acam b of any approved construction, adapted for engagement with a collarb on the stem D.

F represents a portion of the base receiving the material to be stamped,andfa die for said base.

As stated, the improvement consists in the means for attaching the stemto the stamp head or boss E. To that end the stamp head or boss isprovided with the usual drift-opening 10, extending horizontally fromside to side of the stamp head or boss, which driftopening. is incommunication with a vertical socket 11, 'that extends from thedrift-opening to the upper surface ofthe head or boss E. As shown inFig. 2, the walls of the lower portion of the socket or that portionbelow its center are straight, while from the upper portion of thestraight surfaces of the Walls `of the said socket said walls aretapered upwardly or outwardly or are upwardly and outwardly flared, thediameter of the tapering portion of the socket 1l being of greaterdiameter than the diameter of the stem D, adapted to enter said socket,which stem at its lower end is untrimmed and is not in the leastreduced, so that the stem is of equal strength throughout its length. Aplug F is adapted to iit snugly in the straight lower portion of thesocket ll, and this plug is provided with dovetail or tapering recessesl2 in its peripheral surface, the contracted portions of the recessesbeing at the upper portion of said plug, and the side wall of eachrecess 12 is undercut, as shown in Fig. 6 at 13. The upper surface 14 ofthe plug F is convexed, as is likewise its bottom surface l5, and whenthe plug is in position in the socket ll-the bottom of said plug extendsinto the drift-opening l0.

In connection with the plug F a series of straps, arms, or keys G isemployed, lcorresponding in number to the number of re- IOO cesses 12 inthe periphery of said plug F.

. tion with the boss.

prising a body-section 16 and a foot-section 17. The body-section islonger than the footsection and both of them are tapering or dovetailed;but the taper of the sections is in opposite directions, the contractedends of the two sections meeting. Thefoot-section 17 is concaved uponits inner face, and its outer face is convexed proportionately to theconvexity of the periphery of the plug F. The foot-section 17 is of suchdimensions that it will snugly enter a recess 12 in the said plug, andthe side edges of the foot-section of a strap or key are beveled, so asto fit snugly in the undercuts 13. Under this construction thefoot-sections of straps or keys may be placed in position in therecesses 12 without danger of the straps or keys leaving or shiftingfrom the plug when the latter is adjusted to the stem for lowering intothe socket of the boss.

The inner face 1S of the body of each strap or key is concaved and theouter surface is convexed. The said outer surface of the body of eachstrap or key is adapted to iit snugly against the tapering walls of thesocket 11 when the plug and straps are introduced into said socket.Therefore the body-section increases in thickness from its bottomportion upward, but the inner face 18 of each strap or key is adapted tofit snugly to the cylindrical surfaceof the stem D, that is to be drivenbetween the body portions of said straps or keys.

transverse ribs 19 in order that the said straps or keys may take firmhold on the exterior of the stem D.

The plug F is convexed at the top for the purpose of centralizing thepressure of they stem in the event the end of the stem should not bequite square as a result of a break. The bottom of the plug F isconvexed in order that the drift may be used more effectubreaks.

before the plug could be started. Therefore the convexed bottom is ofgreat utility. Af-

ter the parts of the stem-holder have been properlyassembled thestem-holder is adj usty ed to the stem and held to such adjustment untilthe stem has been lowered into the vsocket 11 of the boss, after whichit is driven home. Thus it will be observed that the hithertotroublesome necessity of dressing the end of the stem to fit the socketin the boss is completely done away with and the liability kof the stemto break is greatly reduced by reason of having a joint, as it were,midway'of the socket, which alleviates the vibratory strain on the stemat its intersec- Furthermore, it will be understood that in the event ofa break there will loe only three inches of the stem lost, whereas whenvthe tapered stem is employed under the old method Aof fastening the stemThe inner face 18 of the body portion of each strap or key isprovidedwith there would be a loss of at least six inches, and yet the improvedplug of the stem-holder, which is the cause of this saving, has the sameadhesion as the stem would have if it occupied its place. The straps arepreferably of such width at the top that they are separated somewhatwhen prop'erlygrouped in the plug.

Having thus. described my invention, I claim as new and desire to secureby Letters Patent- 1. The combination of the head or boss having asocket with a transverse drift-opening at the bottom, a plug having aconvexed lower surface projecting into said opening, the stem extendinginto the socket, and means for connecting the stem with the plug.

2. The combination of the head or boss having a socket substantiallycylindrical at its lower portion and widened at its upper portion, aplug located in said lower portion of the socket,- keys engaging theplug at the periphery and extending upwardly at the periphery of thewidened portion of the socket, and a stem held between the upperportions of the keys.

3. The combination of the head or boss having a socket open at its upperend, a plug located in the lower portion of the socket and having aconvexed upper surface, arms engaging the plug at the periphery andextending upwardly therefrom in the socket, and a stem held between theupper portions of the arms and engaging the convexed surface of theplug.

4. Inastamp-mill,astamphead orbosshaving a socket provided with atapering portion and a straight lower portion, a plug fitted to thestraight portion of the socket, straps or keys fitted in the said plugand arranged to conform at their outer side surfaces to the taper of thetapering portion of the socket, the keys above the plug inclosing acentral space and being arranged for engagement with the cylindricalexterior surface of the stem, for the purpose described.

5. The combination of the head or boss having a socket substantiallycylindrical at its lower portion and widened at its upper portion, aplug located in said lower portion of the socket, keys havingfoot-sections inserted in the peripheral portion of said plug, andbody-sections located above the plug and having convexed outer andconcaved inner surfaces, the convexed outer surfaces beinglongitudinally tapered, and a stem held between the upper or bodyportions of the keys.

6. The combination of the head or boss having a socket open at its upperend, a plug located in the lower portion of the socket, varms connectedwith the plug and extending upwardly at the periphery thereof, and astem held between the arms above the plug.

7. The combination of the head or boss having a socket open at its upperend, a plug located in the lower portion of the socket, arms connectedwith the plug and extending upwardly at the periphery thereof, and astem IOO IIO

held between the arms above the plug, the inner surfaces of said armshaving transverse ribs to better hold the same.

8. A fastening device adapted to attach a stein to a stamp head or boss,the said fastening device consisting of a plug, and straps comprising alongitudinal straight foot-section having a dovetail connection With theplug at its exterior, each strap being also provided With anupwardly-flaring body-section having a concaved inner and a convexedouter face, the outer face of the body of each strap beinglongitudinally tapered, and the inner face of the body of each strapbeingroughened, as and for the purpose specified.

9. In a stamp-1nill, a fastening device for attaching a stem to a stamphead or boss, the

MARTIN R. DRISCOLL.

Witnesses:

SAMUEL PORTER JOHN HAsP.

